[AMDGPU] Treat GEP offsets as signed in AMDGPUPromoteAlloca (#157682) [AMDGPU] Treat GEP offsets as signed in AMDGPUPromoteAlloca AMDGPUPromoteAlloca can transform i32 GEP offsets that operate on allocas into i64 extractelement indices. Before this patch, negative GEP offsets would be zero-extended, leading to wrong extractelement indices with values around (2**32-1). This fixes failing LlvmLibcCharacterConverterUTF32To8Test tests for AMDGPU.
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